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Explaining Blue and Green Eyes

Melanin is the natural brown pigment that determines the color of our skin, hair, and eyes. Lipochrome is another natural pigment that confers a yellow color. However, there are no natural blue or green pigments in the human body. So why are some eyes blue and some green? Simon Whistler explains what's happening in those eyes. And I found out why my green eyes are sometimes gray. The eye color discussion is only five minutes long. An ad appears at five minutes, then there are bonus eye facts at about six minutes. -via Digg   

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In checking out this post, I was led down a path that explained how I ended up with a green-eyed deaf cat. When I talk about Marshmallow, people tell me she can't be deaf; only blue-eyed white cats are deaf. But according to Wikipedia, "17 to 22 percent of white cats with nonblue eyes are deaf".
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